I've looked at other posts, but I didn't see where I went wrong.
(review attached screenshot for a better understanding)
In my situation, I add background color to row cells where this is an "A" value in the cell. This stands for an aisle in a warehouse.
If you scroll slowly, then the background color stays within the rows with an "A", but if you scroll too fast, the display shows green in various cells. Also, if I clear the grid and rebuild it with new data, the background color is not reset. The previous rows that were green are still green.
What am I missing?